diff --git a/libc-test/build.rs b/libc-test/build.rs
index 977ff51c7f0fe..1dfa9b255eaa5 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -465,7 +465,9 @@ fn test_windows(target: &str) {
         match name {
             // FIXME: API error:
             // SIG_ERR type is "void (*)(int)", not "int"
-            "SIG_ERR" => true,
+            "SIG_ERR" |
+            // Similar for SIG_DFL/IGN/GET/SGE/ACK
+            "SIG_DFL" | "SIG_IGN" | "SIG_GET" | "SIG_SGE" | "SIG_ACK" => true,
             _ => false,
         }
     });
diff --git a/src/windows/mod.rs b/src/windows/mod.rs
index a83babaed661d..f56ae3bcfc25f 100644
--- a/src/windows/mod.rs
+++ b/src/windows/mod.rs
@@ -233,7 +233,13 @@ pub const SIGSEGV: ::c_int = 11;
 pub const SIGTERM: ::c_int = 15;
 pub const SIGABRT: ::c_int = 22;
 pub const NSIG: ::c_int = 23;
+
 pub const SIG_ERR: ::c_int = -1;
+pub const SIG_DFL: ::sighandler_t = 0;
+pub const SIG_IGN: ::sighandler_t = 1;
+pub const SIG_GET: ::sighandler_t = 2;
+pub const SIG_SGE: ::sighandler_t = 3;
+pub const SIG_ACK: ::sighandler_t = 4;
 
 // inline comment below appeases style checker
 #[cfg(all(target_env = "msvc", feature = "rustc-dep-of-std"))] // " if "